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{{short description|Proposed hypothetical arcology}}
{{Verification|date=November 2022}}
{{Infobox building
| name = X-Seed 4000
| native_name = X-Sen Shushi 7000
| native_name_lang = Japanese
| status =
| image = X-seed4000.jpg
| caption = The design of X-Seed 4000
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| highest_prev =
| building_type = [[Mixed use]]
| roof = {{convert|
| developer = [[Taisei Corporation]]
}}
[[File:XSeed4000BurjDubaiComparison.jpg|thumb|Height comparison between the X-Seed 4000 and the [[Burj Khalifa]]]]
The '''X-Seed 4000''' was a [[concept]] for a [[skyscraper|megatall skyscraper]].<ref name="Accelerating Future">
It was designed for [[Tokyo]], Japan, by the [[Taisei Corporation]] in 1995 as a futuristic environment combining ultra-modern and technological living and interaction with wildlife and nature.<ref>
Unlike conventional skyscrapers, to remain habitable the X-Seed 4000 would
A sea-based location and a [[Mount Fuji]] shape
The X-Seed 4000 is projected to be twice the height of the [[Shimizu Mega-City Pyramid]] at {{convert|2004|m}}. ▼
The Shimizu Mega-City Pyramid (proposed in 2007, also planned for Tokyo, Japan) faces most of the same problems as the X-Seed. Other projects that may be in the top five man made structures are the [[Ultima Tower]] of {{convert|3218|m}} in [[San Francisco]], Dubai City Tower of {{convert|2400|m}} and the [[Bionic Tower]] of {{convert|1228|m}} in either [[Hong Kong]] or [[Shanghai]].▼
▲The X-Seed 4000
▲The Shimizu Mega-City Pyramid (
== See also ==
* [[List of visionary tall buildings and structures]]
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== External links ==
* {{usurped|1=[https://web.archive.org/web/20040517033219/http://www.emporis.com/en/wm/bu/?id=103142 Emporis.com Reference]}}
{{Supertall proposed skyscrapers}}
[[Category:Skyscrapers in
[[Category:Unbuilt buildings and structures in Japan]]
[[Category:Megastructures]]
[[Category:Unbuilt skyscrapers]]
[[Category:Proposed arcologies]]
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